Keystones — Capstone
Five GCSE retrieval questions · 15 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: 5x² + 40x - 8
Answer: 5(x + 4)² - 88 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 13cm, angle = 55°. Give your answer to 2 decimal places
Answer: 69.22cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:30:48 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 84, 74, 42, 88, 10, 39. Give your answer to 2 decimal places
Answer: Mean = 57.14, Median = 63, Range = 78